IAS 16 refers to the International Accounting Standard 16, which specifically deals with the accounting treatment and disclosure requirements for Property, Plant, and Equipment (PPE). This standard provides guidance on recognizing, measuring, and presenting PPE in the financial statements. It outlines the criteria for initial recognition, subsequent measurement, depreciation, revaluation, and derecognition of PPE. Therefore, IAS 16 is related to the accounting treatment of tangible assets like land, buildings, machinery, and vehicles that are used in the production or supply of goods or services, or for administrative purposes.